refactor: add hydrogen station drilldown

src/server/routes/energy/query.ts

@@ -0,0 +1,12 @@
+export type HydrogenCustomerKind = 'external' | 'lingniu' | 'all';
+
+export function parseHydrogenCustomerKind(value: string | undefined): HydrogenCustomerKind {
+  if (value === 'external' || value === 'all') return value;
+  return 'lingniu';
+}
+
+export function parseHydrogenStationId(value: string | undefined): number | null {
+  if (value == null || !/^\d+$/.test(value)) return null;
+  const parsed = Number(value);
+  return Number.isSafeInteger(parsed) && parsed >= 0 ? parsed : null;
+}